Hi, it's always fun meeting and talking to people with different cultures and languages.  However, when it comes to understanding American's it's usually a good idea to understand context of a word or a sentence rather than the "book" or "school" meaning of a word. 

Let me give you an example, I recently sent a message to a girl asking her "if she was real" about a few of the details in her message to me.  Now, context is the big thing here.  She took the use of the word "real" as doubting if she were a real actual person, but the context often used in American English, this is a why of asking about sincerity, confidence, a way to express support to the other or is a person confident in what they are saying/thinking/doing.  Another common phrase you can hear American's say is "Are you for real?" "You real?" or "Get Real".

Those are just a few examples but American's are almost always using casual English in our messages and it is important to recognize cultural context of a sentence and even a single word so that there isn't a misunderstanding.  Hope this helps but when in doubt ask what they mean as things don't always translate well without personal familiarity.